TAPI3 Missing events in .net application

I have a vb.net application that is using Tapi3.dll (version 6.2.92) and Cisco-TSP UI Version 9.1(1.3) to get the call info from call manager. Things are working fine but it seems that some events are not being raised. I saw that some disconnection are not coming through. I might be missing other events that I am unaware of... Any ideas?

I'm not able to access my old voice mail messages all of a sudden. The recording says something like 'the message is currently not available'. This has never happened before in all the years I have been using this system. I have t...
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